I haven't seen any racist stuff from Musk (yet?) What makes a nazi a nazi is their insane obsession with race and blood purity, and a 'socialist national community'.
I think (as I posted earler) that he is an autistic alt right elitist tech-bro like Peter Thiel, Curtis Yarvin & co. (and Zuckerberg recently got into the bandwagon). The blog of Curtis Yarvin makes the views of their elitist kind much more clear than Musk's tweets.
As in they have a bunch of incoherent and disorganized views- some of which are uneducated and stupid- that are all over the place, I think the main thing they have in common is a complete disregard of the 'losers'/underclass of society and social Darwinism. I don't think its a racial thing like it was with a Nazis, but mainly they disregard the personhood of poor people.
So in their dream world, they the "trillionaires" will be Gods in charge of the state/big business and leading mankind to a technological utopia ruling over rest of humanity like kings while siphooning 2/3rds of the world's wealth lol.
The second thing they have in common is a dislike of the weakness and ineffectiveness of liberal democracy- which is why they would prefer takeover of the state by a technocratic elite.